So, I made them myself. They aren't perfect, but they are as close as I can get them with my Sketchup skills. I didn't include the actual screw threads, or the setscrew. But, they should work for whatever you need. Feel free to use or include in another SS sketchup, so long as I am credited.
Link on 3D Warehouse:
https://3dwarehouse.sketchup.com/model/ ... ade-Arbors